as free as a bird的意思：无拘无束
双语例句：
B : To fly in the sky and feel as free as a bird.
比如：在空中飞翔感觉像一只鸟一样自由。
With no tests and no homework, I'm as free as a bird.
没有考试、没有作业，我自由地像只小鸟。
You are free of constraints, making you feel "as free as a bird".
现在的你无拘无束，就像一只自由的小鸟。